I found the Aero a bit cramped but that may just be me.
If you tried a series 1 then they are definitely a bit snug. S2 onwards they moved the doors/wing line further out to give more cockpit room. When I was first looking for an Aero I tried an S1 and the gap between the edge of the wheel and the door meant a bit of oppo on a wet roundabout was a challenge as well! I tried an S2 and the difference made it a lot better.
Compared to an S4 onwards and the CX they show their age but are a wonderful and great value package. I still like the low gangster hood and flat boot with the knock off wheels on the S1 as a style statement. I have seen some people fit a diffuser in the rear lower gap, looks good.
It makes a lot of sense that they released the new CX platform with a Trad style body. I always thought the S1 was closest to the trad with some added natural progression.